CN208154470U - A kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor - Google Patents

A kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor Download PDF

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Publication number
CN208154470U
CN208154470U CN201820439027.4U CN201820439027U CN208154470U CN 208154470 U CN208154470 U CN 208154470U CN 201820439027 U CN201820439027 U CN 201820439027U CN 208154470 U CN208154470 U CN 208154470U
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China
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air
precombustion chamber
sleeve
eddy flow
entrance
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CN201820439027.4U
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Chinese (zh)
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龚彦豪
王登辉
惠世恩
牛艳青
王帅
张�浩
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西安交通大学
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Abstract

The utility model discloses a kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustors, the supply mode of the combustion-supporting Secondary Air of the utility model is divided into inner second air, middle Secondary Air and the air-supply of outer second air channel, so as to be directed to the combustion characteristics of different types of coal, under conditions of Secondary Air comes into operation in guaranteeing eddy flow, by the mode that comes into operation for adjusting direct current inner second air and direct current outer second air, and then pre-burning room air is adjusted to the disturbance situation of coal dust, the time of contact and pulverized coal pyrolysis of coal dust and air and volatile combustion temperature, realize the wide coal adaptability requirement of burner.Simultaneously, the SOFA wind snout that the utility model precombustion chamber shell end outer rim opens up makes eddy flow SOFA wind form swirling eddy around precombustion chamber outlet axes, realize SOFA wind second level eddy flow, a large amount of high temperature gases recirculatings are inhaled from jet boundary volume, so that reducing atmosphere is presented in coal dust primary zone, into burner hearth primary mixture in primary zone high-temperature and low-oxygen combustion, NOx generation amount can be effectively reduced.

Description

A kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor

Technical field

The utility model belongs to Thermal Energy and Power Engineering technical field, and in particular to a kind of remote burnout degree second level eddy flow Wide regulating ratio low-NOx combustor.

Background technique

Instantly, coal is the main body consumption pattern of China's energy.According to《China Statistical Yearbook》Statistics, 2015, China's energy Source total quantity consumed reaches 4,300,000,000 tons of standard coals, and wherein coal is 64% as the specific gravity that fossil energy accounts for non-renewable energy consumption.Root According to《National Power Industry Statistics flash report》It announces, 3,905,800,000,000 kilowatt hour of China's coal fired power generation amount in 2016 accounts for national total power generation 65.2%, compared with 2015 year-on-years increase by 1.3 percentage points.This illustrates status of the coal as the most important non-renewable energy in China It is difficult to shake.

As it can be seen that coal will still occupy in the production of energy and consumption in China within following quite long one period Absolute status.The power generation in China is mainly derived from coal fired power generation, due to areal variation, the coal that China produces phase not to the utmost Together, cover the categories such as anthracite, meager coal, bituminous coal, lignite.The volatile matter content of different types of coal is different, thus is catching fire and burning It is had differences in characteristic.In the design process of power station and Industrial Boiler, need to consider boiler according to the difference for using coal With the type selecting of burner.For design coal, the operating condition of burner is preferable, however, for the factor of resource and cost, In the actual motion of power station and Industrial Boiler, the blending burning for being frequently present of coal dust even becomes the case where coal is burnt.Such feelings Under shape, the operating condition of burner is often not satisfactory, and is easy to appear the problems such as coal dust is difficult to after-flame or Boiler Furnace slagging, causes to fire Burning efficiency reduces, and fluff pulp increases, and results in waste of resources and environmental hazard.

Coal burning is the main source of nitrogen oxides (NOx), and NOx is the main reason that photochemical fog generates, simultaneously And the principal element of acid rain is formed, seriously endanger atmospheric environment and human health.Also, result of study shows that NOx is also big The important sources of gas PM2.5 particle are to cause one of main arch-criminal of national haze weather.In order to reduce dirt of the NOx to environment Dye, China has formulated the discharge standard being increasingly stringenter.National environmental protection portion has issued newest revision within 2011《Thermal power plant Atmosphere pollutants emission standards (GB13223-2011)》, it is specified that the NOx emission concentration limit of coal fired power plant is 100mgm-3, at For most stringent of thermal power plant atmosphere pollutants emission standards in the world.

One of representative as low NOx combusting technology, coal powder pre-burning technology are developed rapidly in recent years.Coal dust into Before entering burner, the precombustion chamber heated by external heat source is first flowed into.Since the oxygen content that First air carries is far below coal Amount of oxygen needed for powder completely burned, precombustion chamber is interior to be presented reducing atmosphere.Coal dust heated fast decoupled in precombustion chamber, releases A large amount of volatile matters, while being precipitated in a gaseous form with a large amount of nitrogenous compounds.The burning of volatile matter part, provides heat for precombustion chamber Amount.Under reducing atmosphere of the excess air coefficient much smaller than 1, HCN, NH3Etc. nitrogenous intermediate product and NOx by a series of Reaction is reduced into N2, so that the generation and discharge of NOx significantly reduce.However, single coal powder pre-burning technology is needed pre-burning Room is arranged before burner, and precombustion chamber needs to heat by external heat source, and a whole set of burner is not only made to become multiple It is miscellaneous, and need to consume external fuel to maintain system to operate normally.

Combustion air is segmented by multistage air distribution and is sent into combustion by Typical Representative of the air classification as low NOx combusting technology Region is burnt, fuel-rich regions and local reduction atmosphere is formed, obviously NOx can be inhibited to generate in process of coal combustion, effectively NOx is reduced finally to discharge.By the rationalization of burner, by two kinds of low NOx combusting technology phases of coal powder pre-burning and air classification Coupling makes it play collaboration denitration effect, while playing the role of simplifying burner and saving fuel cost.

Utility model content

Purpose of the utility model is to overcome the above-mentioned shortcomings and provide a kind of remote burnout degree second level eddy flow wide regulating ratios Low-NOx combustor to the adaptability of coal, raising coal dust firing stability and reduces process of coal combustion for strengthen burning device Middle NOx is generated.The burner can adjust the side of coming into operation of inner second air, middle Secondary Air and outer second air according to coal difference is used Formula realizes the wide coal adaptability requirement of burner to adapt to the combustion characteristics of different types of coal.Meanwhile the burner precombustion chamber The SOFA wind snout that shell end outer rim opens up makes eddy flow SOFA wind form swirling eddy around precombustion chamber outlet axes, realizes SOFA wind second level eddy flow inhales a large amount of high temperature gases recirculatings from jet boundary volume, so that reducing atmosphere is presented in coal dust primary zone, into Enter the primary mixture of burner hearth in primary zone high-temperature and low-oxygen combustion, NOx generation amount reduces.In addition, the burner is by coal powder pre-burning It is coupled to play with air classification and cooperates with denitration effect, coal dust is pyrolyzed in the precombustion chamber of reducing atmosphere and releases volatile matter simultaneously Part burning restores nitrogenous compound, further decreases NOx generation.

In order to achieve the above object, the utility model includes burner outer second air sleeve, burner outer second air sleeve Periphery is connected with the precombustion chamber surrounded by pre-burning room housing, and precombustion chamber hull outside is cased with SOFA windband cylinder, pre-burning room housing end End outer rim circumferentially symmetrically offers 12 SOFA wind snouts along precombustion chamber outlet axes;Precombustion chamber inlet successively covers from the inside to the outside Equipped with central tube, First air sleeve, inner second air sleeve, middle Secondary Air sleeve and outer second air sleeve;First air sleeve is close Pulverized Coal Concentration ring is provided on the inner wall in exit;Flute profile flame holder is provided at First air sleeve outlet;Inner second air sleeve Exit is provided with inner second air flaring;Middle Secondary Air flaring is provided at middle Secondary Air sleeve outlet;Ignition system includes oil Rifle or gas gun, high-energy igniter and for pushing oil gun or gas gun and high-energy igniter to be moved forward and backward in central tube Igniting propeller, ignition system are stretched in precombustion chamber by center pipe end;It is equipped on precombustion chamber side wall for real-time monitoring The infra red flame monitoring device of combustion process Flame state and peep fiery device;

First air cartridges sides offer First air entrance;Inner second air cartridges sides offer inner second air entrance;In Secondary Air cartridges sides offer middle Secondary Air entrance;Outer second air cartridges sides offer outer second air entrance;SOFA windband Cylinder side offers SOFA wind entrance;The mixture of coal dust and air is sent by First air entrance, and in First air sleeve in It is flowed in circular passage between heart pipe;Inner second air flows in the circular passage between inner second air sleeve and First air sleeve It is dynamic;Middle Secondary Air flows in the circular passage between middle Secondary Air sleeve and inner second air sleeve;Outer second air is secondary outside It is flowed in circular passage between windband cylinder and middle Secondary Air sleeve;SOFA wind is in SOFA windband cylinder and precombustion chamber housing outer surface Between circular passage in flow.

It is separately provided for adjusting in inner second air entrance, middle Secondary Air entrance and outer second air access road interior secondary Wind, middle Secondary Air and outer second air come into operation inner second air regulating valve, middle secondary air adjustor valve and the outer second air regulating valve of mode.

Adjustable middle Secondary Air tangential swirl blade is provided in middle Secondary Air access road, the eddy flow angle of blade is η, 50°≤η≤70°;Middle Secondary Air enters precombustion chamber in a manner of rotating jet;Inner second air enters pre-burning in a manner of direct jet Room;Outer second air enters precombustion chamber in a manner of direct jet.

It is provided with adjustable SOFA wind tangential swirl blade in SOFA wind access road, the eddy flow angle of blade is λ, 50 ° ≤λ≤70°;SOFA wind, which is sprayed in a manner of rotating jet from SOFA wind snout, enters burner hearth.

The circumferentially positioned angle of SOFA wind snout is θ, 20 °≤θ≤40 °, the SOFA wind sprayed is made to export axis around precombustion chamber Line forms swirling eddy, realizes SOFA wind second level eddy flow.

The expansion angle of precombustion chamber entrance precombustion chamber inner walls face be γ, 30 °≤γ≤40 °;Precombustion chamber interlude The expansion angle of precombustion chamber inner walls face be δ, 5 °≤δ≤15 °.

Compared with prior art, the utility model using combustion-supporting Secondary Air supply mode be divided into inner second air, in two Secondary wind and the air-supply of outer second air channel, so as to be directed to the combustion characteristics of different types of coal, Secondary Air comes into operation in guaranteeing eddy flow Under conditions of, the throwing of valve regulation direct current inner second air and direct current outer second air is adjusted by inner second air regulating valve and outer second air With mode, and then pre-burning room air is adjusted to the disturbance situation of coal dust, the time of contact of coal dust and air and pulverized coal pyrolysis The wide coal adaptability requirement of burner is realized with volatile combustion temperature to adapt to the combustion characteristics of different types of coal.For example, For low volatile coal, inner second air regulating valve can be closed, come into operation middle Secondary Air and the air-supply of outer second air channel, in coal dust Secondary Air plays disturbance to coal dust and promotes immixture in kindling initial stage eddy flow, and it is steady to realize that the burning of coal dust high concentration improves kindling Qualitative, direct current outer second air delays the mixing of coal dust and combustion air, reduces NOx and generates;It, can be with for high-volatile coal Outer second air regulating valve is closed, come into operation inner second air and the air-supply of middle secondary air channel, in coal powder ignition initial stage direct current inner second air Secondary Air is to the disturbance of coal dust in appropriate weakening eddy flow and appropriate supplemental oxygen makes the burning of volatile matter part improve combustion stability, Reducing atmosphere reduces NOx generation amount in precombustion chamber simultaneously.In addition, Secondary Air is in precombustion chamber in eddy flow for different types of coal The recirculating zone of interior formation makes high temperature gases recirculating, improves the stability of coal powder ignition, meanwhile, oxygen in the high-temperature flue gas of reflux Gas content is lower, further decreases NOx generation.

Further, the utility model precombustion chamber shell end outer rim circumferentially symmetrically offers 12 along precombustion chamber outlet axes A SOFA wind snout, the circumferentially positioned angle of SOFA wind snout are θ, 20 °≤θ≤40 °, go out the SOFA wind sprayed around precombustion chamber Mouthful axis forms swirling eddy, realizes SOFA wind second level eddy flow, improves the intensity of eddy flow SOFA wind rotating jet, be conducive to from Jet boundary volume inhales the smoke backflow of a large amount of high-temperature low-oxygens, so that reducing atmosphere is presented in coal dust primary zone, promotes combustion process Middle NOx reduction, further decreases NOx generation.

Further, the expansion angle of the utility model precombustion chamber interlude precombustion chamber inner walls face be δ, 5 °≤δ≤ 15 °, so that the jet stream circumference of Secondary Air is elongated, precombustion chamber recirculating zone becomes larger, and drives more high temperature gases recirculatings, improves coal The stability of powder kindling, meanwhile, oxygen concentration reduces in precombustion chamber, further decreases NOx generation.

Further, the utility model First air sleeve is provided with Pulverized Coal Concentration ring on the inner wall in exit, utilizes Primary air powder mixture is separated into interior dense outer light type air-flow by inertia;Flute profile flame holder is provided at First air sleeve outlet, by force Changed the disturbance of breeze airflow with mix;Inner second air flaring is provided at inner second air sleeve outlet, middle Secondary Air sleeve goes out It is provided with middle Secondary Air flaring at mouthful, delays the mixing of breeze airflow Yu combustion-supporting Secondary Air.Therefore, air-flow center high concentration Coal powder ignition stability is good, and NOx generation amount is low.

Further, the utility model is provided with high-energy igniter, oil gun or gas gun, light a fire propeller and infrared fire It flame monitoring device and peeps fiery device, improves the stability of the gentle monitoring burning of Automated water.When needing to light a fire, propeller is forward High-energy igniter and oil gun or gas gun are sent to ignition location by operation.After igniting, propeller is moved forwards, by high energy point Firearm and oil gun or gas gun shrink back central tube, avoid high temperature from washing away, corrode and coking pollution, extend high-energy igniter and oil The service life of rifle or gas gun.

Detailed description of the invention

Fig. 1 is the overall structure diagram of the utility model;

Fig. 2 is the cross-sectional view in the direction A-A in Fig. 1;

Fig. 3 is the right view of the utility model;

Fig. 4 is the cross-sectional view in the direction C-C in Fig. 1;

Fig. 5 is the partial sectional view of SOFA wind snout in the utility model.

Wherein, 1 is high-energy igniter;2 be oil gun or gas gun;3 be igniting propeller;It is managed centered on 4;5 be First air Sleeve;6 be inner second air entrance;7 inner second air regulating valves;8 be middle Secondary Air entrance;Secondary air adjustor valve in 9;10 be outer two Secondary wind entrance;11 be outer second air regulating valve;12 be infra red flame monitoring device;13 be to peep fiery device;14 be SOFA wind entrance; 15 be pre-burning room housing;16 be precombustion chamber;17 be SOFA windband cylinder;18 be SOFA wind snout;19 be flute profile flame holder;20 be interior Secondary Air flaring;21 are flared for middle Secondary Air;22 be SOFA wind tangential swirl blade;23 be Pulverized Coal Concentration ring;24 be outer secondary Windband cylinder;25 be middle Secondary Air sleeve;26 be middle Secondary Air tangential swirl blade;27 be inner second air sleeve;28 be First air Entrance.

Specific embodiment

The utility model is described further with reference to the accompanying drawing.

Referring to Fig. 1 to Fig. 5, the utility model includes the 24 periphery connection of burner outer second air sleeve by pre-burning room housing 15 precombustion chambers 16 surrounded, the expansion angle of 16 entrance pre-burning room housing of precombustion chamber, 15 inner wall are γ, 30 °≤γ≤40 °; The expansion angle of 16 interlude pre-burning room housing of precombustion chamber, 15 inner wall be δ, 5 °≤δ≤15 °;It is cased on the outside of pre-burning room housing 15 SOFA windband cylinder 17,15 end outer rim of pre-burning room housing circumferentially symmetrically offer 12 SOFA wind sprays along 16 outlet axes of precombustion chamber Mouth 18;The circumferentially positioned angle of SOFA wind snout 18 is θ, 20 °≤θ≤40 °, the SOFA wind sprayed is made to export axis around precombustion chamber 16 Line forms swirling eddy, realizes SOFA wind second level eddy flow.It is equipped on 16 side wall of precombustion chamber in real-time monitoring combustion process The infra red flame monitoring device 12 of flame status and peep fiery device 13.16 inlet of precombustion chamber is successively set with center from the inside to the outside Pipe 4, First air sleeve 5, inner second air sleeve 27, middle Secondary Air sleeve 25 and outer second air sleeve 24.Ignition system is by center 4 end of pipe stretches in precombustion chamber 16, and ignition system includes oil gun or gas gun 2, high-energy igniter 1 and for pushing oil gun Or the igniting propeller 3 that gas gun 2 and high-energy igniter 1 are moved forward and backward in central tube 4.

5 side of First air sleeve offers First air entrance 28;First air sleeve 5 is provided on the inner wall in exit Primary air powder mixture is separated into interior dense outer light type air-flow using inertia by Pulverized Coal Concentration ring 23;5 exit of First air sleeve is set It is equipped with the flute profile flame holder 19 for improving coal dust firing stability.27 side of inner second air sleeve offers inner second air entrance 6;It is provided in 6 channel of inner second air entrance and comes into operation the inner second air regulating valve 7 of mode for adjusting inner second air;Inner second air 27 exit of sleeve is provided with inner second air flaring 20.Middle 25 side of Secondary Air sleeve offers middle Secondary Air entrance 8;In it is secondary It is provided in 8 channel of wind entrance and comes into operation the middle secondary air adjustor valve 9 of mode for Secondary Air in adjusting;Meanwhile middle Secondary Air enters It is provided with adjustable middle Secondary Air tangential swirl blade 26 in mouthful 8 channels, the eddy flow angle of blade is η, 50 °≤η≤70 °;In 25 exit of Secondary Air sleeve is provided with middle Secondary Air flaring 21.24 side of outer second air sleeve offers outer second air entrance 10;It is provided in 10 channel of outer second air entrance and comes into operation the outer second air regulating valve 11 of mode for adjusting outer second air.SOFA 17 side of windband cylinder offers SOFA wind entrance 14;Adjustable SOFA wind tangential swirl leaf is provided in 14 channel of SOFA wind entrance Piece 22, the eddy flow angle of blade are λ, 50 °≤λ≤70 °.The mixture of coal dust and air is sent by First air entrance 28, and It is flowed in circular passage between First air sleeve 5 and central tube 4;Inner second air is in inner second air sleeve 27 and First air sleeve It is flowed in circular passage between 5;Circular passage of the middle Secondary Air between middle Secondary Air sleeve 25 and inner second air sleeve 27 Interior flowing;Outer second air flows in the circular passage between outer second air sleeve 24 and middle Secondary Air sleeve 25;SOFA wind exists It is flowed in circular passage between 15 outer surface of SOFA windband cylinder 17 and pre-burning room housing.

The principles of the present invention:

The recirculating zone volume that the utility model is formed in precombustion chamber using Secondary Air in eddy flow inhales high-temperature flue gas, to precombustion chamber Interior coal dust is heated, and coal dust heated fast decoupled in precombustion chamber releases a large amount of volatile matters, while with a large amount of nitrogenous Compound is precipitated in a gaseous form.The burning of volatile matter part, provides heat for precombustion chamber.In excess air coefficient much smaller than 1 Under reducing atmosphere, nitrogenous compound is reduced into N by series reaction in precombustion chamber2, so that NOx generates significant drop It is low.Meanwhile flowing back into the high-temperature flue gas of precombustion chamber that oxygen content is relatively low, it further reduced the indoor oxygen concentration of pre-burning, NOx is inhibited to generate.

In order to guarantee the indoor low-oxygen environment of pre-burning, it is desirable that:

The meter of theory needed for (primary air flow (coal dust)+inner second air amount+middle secondary air flow+outer second air amount)/coal dust firing Calculate total blast volume < 0.85

That is excess air coefficient total in precombustion chamber is less than 0.85.

Since for excess air coefficient less than 0.85, the indoor oxygen of pre-burning is most of by pulverized coal pyrolysis and volatilization in precombustion chamber The consumption of branch's divided combustion.Therefore the mixed gas that unburned volatile matter, high-temperature flue gas and pulverized coal particle etc. enter burner hearth is conveyed Middle oxygen content is lower, is conducive to tissue coal dust high-temperature and low-oxygen combustion in burner hearth, is further reduced NOx generation.

The utility model precombustion chamber shell end outer rim circumferentially symmetrically offers 12 SOFA wind along precombustion chamber outlet axes Spout, the circumferentially positioned angle of SOFA wind snout are θ, 20 °≤θ≤40 °, make the SOFA wind sprayed around precombustion chamber outlet axes shape At swirling eddy, realizes SOFA wind second level eddy flow, improve the intensity of eddy flow SOFA wind rotating jet, be conducive to from jet boundary Volume inhales a large amount of high temperature gases recirculatings so that reducing atmosphere is presented in coal dust primary zone, into burner hearth primary mixture in main combustion Area's high-temperature and low-oxygen combustion promotes NOx reduction in combustion process, further decreases NOx generation.

The course of work of the utility model:

Firstly, being directed to the combustion characteristics of different types of coal, Secondary Air is selected to come into operation mode as needed.By inner second air, in Secondary Air and outer second air are sent by inner second air entrance 6, middle Secondary Air entrance 8 and outer second air entrance 10, inner second air It is flowed in circular passage between inner second air sleeve 27 and First air sleeve 5, middle Secondary Air is in middle 25 He of Secondary Air sleeve Flowed in circular passage between inner second air sleeve 27, outer second air outer second air sleeve 24 and middle Secondary Air sleeve 25 it Between circular passage in flow, and enter in precombustion chamber 16,1 minute or more purging carried out to precombustion chamber 16.

Then igniting propeller 3 is moved forwards, high-energy igniter 1 and oil gun or gas gun 2 is sent to specified igniting Position.High-energy igniter 1 works, and puts the fuel that oil combustion gun or gas gun 2 export.For the combustion characteristics of different types of coal, according to Need to select Secondary Air to come into operation mode.By inner second air, middle Secondary Air and outer second air by inner second air entrance 6, in it is secondary Wind entrance 8 and outer second air entrance 10 are sent into, and annular of the inner second air between inner second air sleeve 27 and First air sleeve 5 is logical It is flowed in road, middle Secondary Air flows in the circular passage between middle Secondary Air sleeve 25 and inner second air sleeve 27, outer secondary Wind flows in the circular passage between outer second air sleeve 24 and middle Secondary Air sleeve 25, and enters in precombustion chamber 16.In two The middle secondary wind direction swirl vane 26 that can be adjusted is provided in secondary 8 channel of wind entrance, Secondary Air shape in precombustion chamber 16 in eddy flow At recirculating zone, the stability of coal powder ignition is improved.

Coal dust and air mixture are sent by First air entrance 28, the mixture is between First air sleeve 5 and central tube 4 Circular passage in flow, due to effect of inertia, be separated into the coal dust that center is dense, surrounding is light after through Pulverized Coal Concentration ring 23 Air-flow occurs pyrolysis and releases volatile matter, and the flame point generated by oil gun or the outlet of gas gun 2 after entering precombustion chamber 16 Combustion.Flute profile flame holder 19, inner second air flaring 20 and middle Secondary Air flaring 21 improve the stability of coal powder ignition.

By adjusting inner second air regulating valve 7, the valve opening of middle secondary air adjustor valve 9 and outer second air regulating valve 11, The mode that comes into operation of adjustable inner second air, middle Secondary Air and outer second air, and then can be according to the different combustion characteristics of coal To adjust the swirl strength of Secondary Air and the size of recirculating zone.It is insufficient in the oxygen content that First air and Secondary Air carry In the case of, reducing atmosphere is presented in precombustion chamber 16, the nitrogenous compound that pulverized coal pyrolysis generates is reduced by series reaction At N2, so that NOx generation amount significantly reduces.The mixture that unburned volatile matter, high-temperature flue gas and pulverized coal particle are formed is pre- Combustion 16 second half section of room uniformly mixes, and is then fed into hearth combustion.

SOFA wind is sent by SOFA wind entrance 14, SOFA wind SOFA windband cylinder 17 and 15 outer surface of pre-burning room housing it Between circular passage in flow.Adjustable SOFA wind tangential swirl blade 22, precombustion chamber are provided in 14 channel of SOFA wind entrance 15 end outer rim of shell circumferentially symmetrically offers 12 SOFA wind snouts 18 along 16 outlet axes of precombustion chamber, SOFA wind snout 18 Circumferentially positioned angle is θ, 20 °≤θ≤40 °, the SOFA wind sprayed is made to form swirling eddy around 16 outlet axes of precombustion chamber, realized SOFA wind second level eddy flow, improves the intensity of eddy flow SOFA wind rotating jet, burns away the same of required oxygen in supplement coal dust When, the smoke backflow of a large amount of high-temperature low-oxygens is inhaled from burner hearth curls inward, so that reducing atmosphere is presented in coal dust primary zone, is promoted burned NOx is restored in journey, further decreases NOx generation.

After coal powder ignition in precombustion chamber 16 is stablized, igniting propeller 3 is acted, by high-energy igniter 1 and oil gun or combustion gas Rifle 2 retracts in central tube 4, to prolong its service life.Infra red flame monitoring device 12 is by peeping fiery device 13 prison in real time simultaneously It surveys combustion flame state to sound an alarm when putting out a fire, and stops the input of coal dust in time, re-execute purging and igniting Operation.

Claims (6)

1. a kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor, which is characterized in that including secondary outside burner Windband cylinder (24), burner outer second air sleeve (24) periphery are connected with the precombustion chamber (16) surrounded by pre-burning room housing (15), SOFA windband cylinder (17) is cased on the outside of pre-burning room housing (15), pre-burning room housing (15) end outer rim exports axis along precombustion chamber (16) Line circumferentially symmetrically offers 12 SOFA wind snouts (18);Precombustion chamber (16) inlet is successively set with central tube from the inside to the outside (4), First air sleeve (5), inner second air sleeve (27), middle Secondary Air sleeve (25) and outer second air sleeve (24);First air Sleeve (5) is provided with Pulverized Coal Concentration ring (23) on the inner wall in exit;It is steady that First air sleeve (5) exit is provided with flute profile Flame device (19);Inner second air sleeve (27) exit is provided with inner second air flaring (20);Middle Secondary Air sleeve (25) exit It is provided with middle Secondary Air flaring (21);Ignition system includes oil gun or gas gun (2), high-energy igniter (1) and for pushing The igniting propeller (3) that oil gun or gas gun (2) and high-energy igniter (1) are moved forward and backward in central tube (4), ignition system by Central tube (4) end stretches in precombustion chamber (16);It is equipped on precombustion chamber (16) side wall in real-time monitoring combustion process It the infra red flame monitoring device (12) of flame status and peeps fiery device (13);
First air sleeve (5) side offers First air entrance (28);Inner second air sleeve (27) side offers inner second air Entrance (6);Middle Secondary Air sleeve (25) side offers middle Secondary Air entrance (8);Outer second air sleeve (24) side offers Outer second air entrance (10);SOFA windband cylinder (17) side offers SOFA wind entrance (14);The mixture of coal dust and air by First air entrance (28) is sent into, and is flowed in the circular passage between First air sleeve (5) and central tube (4);Inner second air It is flowed in circular passage between inner second air sleeve (27) and First air sleeve (5);Middle Secondary Air is in middle Secondary Air sleeve (25) it is flowed in the circular passage between inner second air sleeve (27);Outer second air outer second air sleeve (24) and in it is secondary It is flowed in circular passage between windband cylinder (25);SOFA wind SOFA windband cylinder (17) and pre-burning room housing (15) outer surface it Between circular passage in flow.
2. a kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor according to claim 1, feature exist In being separately provided for adjusting in inner second air entrance (6), middle Secondary Air entrance (8) and outer second air entrance (10) channel Inner second air, middle Secondary Air and outer second air come into operation the inner second air regulating valve (7) of mode, middle secondary air adjustor valve (9) and outer Secondary air adjustor valve (11).
3. a kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor according to claim 1, feature exist In being provided with adjustable middle Secondary Air tangential swirl blade (26) in middle Secondary Air entrance (8) channel, the eddy flow angle of blade is η, 50 °≤η≤70 °;Middle Secondary Air enters precombustion chamber (16) in a manner of rotating jet;Inner second air is entered in a manner of direct jet Precombustion chamber (16);Outer second air enters precombustion chamber (16) in a manner of direct jet.
4. a kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor according to claim 1, feature exist In, adjustable SOFA wind tangential swirl blade (22) is provided in SOFA wind entrance (14) channel, the eddy flow angle of blade is λ, 50°≤λ≤70°;SOFA wind, which is sprayed in a manner of rotating jet from SOFA wind snout (18), enters burner hearth.
5. a kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor according to claim 1, feature exist In the circumferentially positioned angle of SOFA wind snout (18) is θ, 20 °≤θ≤40 °, exports the SOFA wind sprayed around precombustion chamber (16) Axis forms swirling eddy, realizes SOFA wind second level eddy flow.
6. a kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor according to claim 1, feature exist In the expansion angle of, precombustion chamber (16) entrance pre-burning room housing (15) inner wall be γ, 30 °≤γ≤40 °;Precombustion chamber (16) The expansion angle of interlude pre-burning room housing (15) inner wall be δ, 5 °≤δ≤15 °.
CN201820439027.4U 2018-03-29 2018-03-29 A kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor CN208154470U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110822423A (en) * 2019-10-08 2020-02-21 西安交通大学 Multi-purpose burner with fins and different-diameter gas self-rotating premixing function
CN110848693A (en) * 2019-10-08 2020-02-28 西安交通大学 Dual-purpose combustor of coal, gas with abrasionproof distortion blade flow equalizes
CN110848692A (en) * 2019-10-08 2020-02-28 西安交通大学 Air shunting spinning part premixing dual-fuel low NOx burner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110822423A (en) * 2019-10-08 2020-02-21 西安交通大学 Multi-purpose burner with fins and different-diameter gas self-rotating premixing function
CN110848693A (en) * 2019-10-08 2020-02-28 西安交通大学 Dual-purpose combustor of coal, gas with abrasionproof distortion blade flow equalizes
CN110848692A (en) * 2019-10-08 2020-02-28 西安交通大学 Air shunting spinning part premixing dual-fuel low NOx burner

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